hamann



No. 6|2,723. Patented 0st. I8, |898. C. H. 0. HAMANN.

SLED PRDPELLER.

(Applieation led May 2, 1898,) (No Model.) 3 Sheets-Sham 2.

No. 6I2,723. Patented 0st. I8, |898. C. H. 0. HAMANN.

SLED PBDPELLER.

(Application lad my 2, 1898.)

s sham-sheet 3.

(Nn Model.)

'me Norms PETERS no.. PHo1o.LrrHo..wAs 4mcToN. D. c.

i l UNiTnn i' STATES? PATENT OFFICE.

CARL HEINRICH OTTO HAMANN, OF BERGEDORF, GERMANY.

-SLED-PROPELLER.

SPECIFICATION forming part ofl Letters Patent No. 612,723, dated October 18, 1898. Application filed May 2, 1898. Serial No. 679,528. (No model.)

T all whom it may concern:

Be it known that I, CARL HEINRICH OTTO HAMANN, a subject of the German Emperor, residing at Bergedorf, near Hamburg, in the German Empire, have invented a new and usefullmprovement in the Propulsion of Sleds,

. Carts, and other Conveyances, of which the following is a specification.

Myinvention relates to improvements in the propulsion of sleds, carts, and other convey; ances on smooth or even roadways and dromoi. The mechanism employed consists of two propelling-levers which are arranged in the path of a revolving gearing on the drivingshaft of the vehicle in such a manner that the lower pointed extremities of these levers are alternatel y moved toward the roadway and passed above the same, whereby the vehicle, which is at times laterally supported by the said levers, is propelled forward on actuating the revolving gearing.

In order to make my invention more clearly understood, reference may be taken to the accompanying drawings, in which- Figure 1 is a side elevation of a sled provided with my improved driving mechanism, Figs. 2 to 5 being separate side views of the driving mechanism, illustrating diiferent positions of the propelling members during the rotation of the main driving-gear; and Fig. 6 is a side elevation of a somewhat-modified construction of the revolving drivin g-gear and the propelling members, also in connection with a sled. f

In Figs. l to 5 a lantern-wheel or wallower a, provided on either side with a series of rungs or rollers a and a2, respectively, serves as revolving gear keyed upon au ordinary pedalshaft. The rungs or rollers on the one side of the revolving gear are displaced about onehalf of the pitch to those of the other side, and they coperate with the corresponding propelling-levers b' and b2, respectively,which are pivoted at b3 to the arm b4 of the frame A of the sled. At the lower extremity of the levers are hinged sharp pointed hooks or grasping-feet c and c2, respectively. That part of the said propelling-levers b' b2 coperating with the rollers ct' a2 of the revolving gear a is shaped in such a manner that the levers are caused to perform a walking motion,

tion until the one roller a2, hitherto in contact with the upper arm of the lever, releases the latter and simultaneously another roller a2 commences to travel upon the swelling b6 of the lever b2. At this moment the corresponding roller a commences to leave the continues to move forward without interrup swelling b5 of the other lever b' and another roller a' begins to lift the upper arm of the lever, Fig. t.

Now the above-described workin g operation is 1epeated-l1oweve1, with the difference that the propelling-lever b2 becomes active andis caused to propel the vehicle ahead, while the other lever b is advanced into the active position. The first propping-point s' of the roadway will then be released and a second point s2 for the lever b2 comes to eifect. lVith regard to this second propping-pointFig. 5 i1lustrates the intermediate position of both the propelling-levers.

In stead of a wallower with two series of rollers a disk d with two corrugated rims may be employed, in which the projecting faces d and d2, respectively, of the one rim are arranged beside the contracted faces of the other rim, Fig. 6. With these corrugated rims cooperate the levers b b2 in a similar manner as above described, since springs f tend to constantly draw the antifriction-rollers b" of the levers against the corrugated rims of the disk d on the main drivingshaft of the vehicle. The projecting faces of the rims serve to actnate the levers b' and b2: in such a manner that the somewhat-outwardlyfdirected pickets e e2, attached thereto, are alternately caused to propel the vehicle ahead, while the springs f are adapted to withdraw the picket and advance the same into the active position.

The conveyance A mayV be provided with sled-runners g or with rolls or wheels for traveling on a smooth or even roadwayi IOO Having fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A propelling mechanism, comprising a vehicle-frame, a pedal-shaft carried thereby, a driving-wheel secured to said shaft and provided with cylindrical cogs a' a2 projecting from its opposite faces and displaced relatively to one another as described, in combination with the propelling-levers b b2 constructed as set forth and adapted to receive a motion akin to Walking,r from the said driving-Wheel, substantially as and for the purpose set forth.

2. The combination with a framing provided With short fore and aft runners g, a

CARL HEINRICH OTT() HAMANN.

Witnesses z MAX LEMCKE, REINHARD OSTERMEYER. 

